1) Ensure the LCB dead zone is set to zero (in settings). This will eliminate most of the issues above.
2) Place a LCB so the LCB boundary is adjacent to the trader protected area.
3) This should allow building and retrieving placeables to the max extent possible.
After some game time and experience, reflect back on your OP and appreciate that 7d2d does not have to be trader centric and that for many players it's actually a better game experience without them (or quests at least). Accept that its a big wide virtual world with 100's of POIs and open space to explore. Enjoy exploring it, making mistakes, and learning from them.